I'm not particularly sure what it does but there is now an option to "Show Loss of Control Bars". It's likely the fruition of Xelnath'sgiant thread a few weeks back and has something to do with being CCed but I haven't been able to find anything it actually changes yet.
A whole buncha changes, including all those previously mentioned AIR client changes, are packed in this one. This is the first time they have been applied to the actual PBE game client and not just datamined from the AIR client.
* Note: These numbers are relative to what they are currently on LIVE servers vs what they are currently on the PBE server.
Base Mana reduced to 200 ( +40 per level ) from 240 (+40 per level ).
Rocket Grab ( Q ) mana cost increased to 120 mana at all ranks from 110.
Feral Scream ( W ) silence duration reduced to 1.5/1.75/2/2.25/2.5 seconds from 2/2.3/2.5/2.8/3 seconds
Neurotoxin ( Q ) mana cost increased to 80/85/90/95/100 from 60 at all ranks.
Cocoon ( E ) mana cost reduced to 50 at all ranks from 65.
Rising Spell Force ( Passive ) duration reduced to 5 seconds from 6 seconds.
Trueshot Barrage ( R ) now deals 10% less damage for each unit it passes through up from 8%
Bouncing Blades ( Q ) base damage lowered to 60/85/110/135/160 from 60/90/120/150/180.
Death Lotus ( R ) AP ratio increased to 2 from 1.75
Shunpo ( E ) damage reduction duration reduced to 1.5 seconds from 3 seconds.
Slicing Maelstrom ( R ) energy cost reduced to 0 from 50/45/40 energy.
Meditate ( W ) heal increased to 200/350/500/650/800 from 140/280/420/560/700.
Meditate ( W ) mana cost reduced to 50/65/80/95/110 from 70/80/90/100/110.
Meditate AP ( W ) ratio reduced to 2 AP from 4 AP.
Base Movement speed increased to 350 from 340.
Blood Boil ( W ) movement speed increase lowered to 8/9/10/11/12% from 11/12/13/14/15%
Blood Boil ( W ) attack speed increase lowered to 25/30/35/40/45% from 25/35/45/55/65%.
Blood Boil ( W ) duration lowered to 12 seconds from 15 seconds.
Undertow's ( Q ) slow now fades over time.
Vicious Strikes ( W ) cooldown increased to 16 at all ranks from 12 seconds.
Ragnarok no longer grants passive Armor penetration and instead grants 10/20/30 armor pen while Ragnarok is active.